U.S. Nuclear Regulatory Commission, Division of Contracts, Attn: Linda Wise MS-T-7I2, Washington, D.C. 20555

A -- BROAD AGENCY ANNOUNCEMENT FOR THERMAL HYDRAULIC RESEARCH SOL RS-RES-98-038 DUE 110497 POC Steve Pool, Contract Specialist, 301-415-8168 The Nuclear Regulatory Commission (NRC) is seeking innovative ideas in the general area of two-phase flow modeling. Research proposals are solicited in three areas pertaining to two-phase flow simulations: 1) advancement of the numerical methods used in the simulation of two-phase flows as related to the NRC thermal-hydraulic codes (RELAP5 and TRAC-P), 2) quantification of the uncertainties associated with two-phase flow modeling, and 3) the development and assessment of two-phase flow models for use in a computational fluid dynamics (CFD) code. The area of numerical methods for two-phase flow typically applies to solving a six equation (2 mass, 2 momentum, 2 energy) description of water and steam flow through a mainly one-dimensional (some 3-D components) network of pipes and vessels which represent the cooling system of a nuclear reactor. Codes of this type are in use by the NRC at this time. The NRC goals for this research include: improved code robustness, improved code accuracy, and extendability of the code. Areas of interest include differencing, meshing, solution techniques, coupling of solutions to other codes (CFD for example), and other topics related to two-phase numerical solutions. Consideration can be given to any methods that show promising results and are adaptable to existing codes without the need for a major revision of the codes. The NRC is interested in quantifying the uncertainties in the two-phase constitutive models used in the NRC's own reactor system analysis codes. Models have been evaluated in integral type tests where compensating errors can hide the true uncertanty of individual model formulations. Fundamental assessments of individual constitutive relations will allow the NRC to decide whether compensating errors in model formulations exist. The NRC is interested in using two-phase CFD techniques in nuclear reactor applications. Two-phase CFD is an emerging technology with many possible approaches. The NRC is interested in the types of available approaches and their range ofapplicablity. This synopsis constitutes a Broad Agency Announcement (BAA) per FAR 6.102(d)(2)(i); there will be no formal request for proposals (RFP) or other solicitation in regard to this announcement. Written proposals may be submitted by all concerns -- small businesses, large businesses and universities, etc. and will be accepted until 3:30pm local time on November 4, 1997. Multiple firm fixed price type contract awards are anticipated. Offerors shall submit separate proposals for any or all areas of interest for which they wish to be considered. The Government reserves the right to select all, some, or none of the proposals received in response to this announcement. The estimated budget range for a contract will be $100K to $150K. Offerors shall submit their written technical proposals (four copies) and written cost proposals (four copies) to the U.S. Nuclear Regulatory Commission, Division of Contracts and Property Management, Mailstop T-7-I-2, 11545 Rockville Pike, Rockville, MD 20852. Proposals shall contain a cover page including proposal title, technical and administrative points of contact with telephone and facsimile numbers and be followed by a letter signed by an authorized official specifying the proposal validity period (at least 90 days). Offerors shall submit technical proposals with the following minimum information: (1) A resume for the principal investigator outlining his relevant education, experience, and publications, (2) a narrative setting forth the proposed statement of work and describing the proposed methodology for accomplishing the work, what criteria will be used to determine the success of the research, and what different alternatives were considered or are available, (3) a narrative describing the proposed organization's experience in performing the type of research described, (4) a description of the research facilities which the offeror is proposing to use including the offeror's degree of access to these facilities. Offerors shall submit a cost proposal with appropriate cost breakdown per FAR Table 15-3 for each technical proposal submitted. Proposals will be evaluated and selected for award based on the following factors: (1) overall technical merit, (2) importance of the proposed research to agency programs, (3) number and mix of research proposals received in each subject area, (4) availability of funds, (5) realism and reasonableness of proposed costs. Overall technical merit will be evaluated and numerically scored based on the following criteria: (1) qualifications of the principal investigator (50%); (2) soundness of proposed technical approach (20%), (3) organizational experience (20%); and (4) adequacy of research facilities (10%).***** (0246)

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